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truncate.c

Version: [1.0] [0.99.11] [0.99] [0.98] [0.97] [0.96a] [0.95] [0.12] [0.11] [0.01]
Architecture: [i386]

  1 /*
  2  *  linux/fs/truncate.c
  3  *
  4  *  (C) 1991  Linus Torvalds
  5  */
  6 
  7 #include <linux/sched.h>
  8 
  9 #include <sys/stat.h>
 10 
 11 static void free_ind(int dev,int block)
 12 {
 13         struct buffer_head * bh;
 14         unsigned short * p;
 15         int i;
 16 
 17         if (!block)
 18                 return;
 19         if (bh=bread(dev,block)) {
 20                 p = (unsigned short *) bh->b_data;
 21                 for (i=0;i<512;i++,p++)
 22                         if (*p)
 23                                 free_block(dev,*p);
 24                 brelse(bh);
 25         }
 26         free_block(dev,block);
 27 }
 28 
 29 static void free_dind(int dev,int block)
 30 {
 31         struct buffer_head * bh;
 32         unsigned short * p;
 33         int i;
 34 
 35         if (!block)
 36                 return;
 37         if (bh=bread(dev,block)) {
 38                 p = (unsigned short *) bh->b_data;
 39                 for (i=0;i<512;i++,p++)
 40                         if (*p)
 41                                 free_ind(dev,*p);
 42                 brelse(bh);
 43         }
 44         free_block(dev,block);
 45 }
 46 
 47 void truncate(struct m_inode * inode)
 48 {
 49         int i;
 50 
 51         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
 52                 return;
 53         for (i=0;i<7;i++)
 54                 if (inode->i_zone[i]) {
 55                         free_block(inode->i_dev,inode->i_zone[i]);
 56                         inode->i_zone[i]=0;
 57                 }
 58         free_ind(inode->i_dev,inode->i_zone[7]);
 59         free_dind(inode->i_dev,inode->i_zone[8]);
 60         inode->i_zone[7] = inode->i_zone[8] = 0;
 61         inode->i_size = 0;
 62         inode->i_dirt = 1;
 63         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 64 }
 65 
 66

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Oldlinux Cross Reference Linux/fs/truncate.c

Oldlinux Cross Reference
Linux/fs/truncate.c